DBS isn't doing too bad on weeknights. I think that is an outlier though, I doubt a second anime would do well on weeknights. DBS is kind of a unique property in terms of audience appeal.
I think toonami is in a good place, though I think there is going to be a much sharper P2+ drop when FLCL Regressive goes into reruns. I think key demo might remain strong, but with Live PD coming back to new programs it is going to be much more difficult to retain what DBS brings in, and even DBS will likely see a drop in total audience.